Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd05a68c765f665…

MALICIOUS

PDF

82.9 KB Created: 2021-07-06 08:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f0a649568dd98a03dbb6ffbf23ee0dda SHA-1: d94cb3adf35af73574f8240233e1a6f5577af530 SHA-256: 3bd05a68c765f665678f9b38ae8299fe9b975ba17ad9e2e6b6c390cf63bc6753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS platforms. The presence of many unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://absolutelyneon.com/userfiles/file/zusugalagosazepepozisenob.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/zivemikobilar.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9373adc8nn65r8k4l77oj1k57j/13229638121.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/33600695784.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/2549096752.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/bagulalupuruzotutetusuvef.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61839346801.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/thm701g3k4v2grn845aram374e/97893755284.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b492789aa---48705772445.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/mawomum.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a67cb798a73---13500877675.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160986c357c704---fikafexupowiwudif.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/35489211385.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607628116e60b---59697492569.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607487c82dea0---ribiliso.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c67ffb086dd06757ae37fd60eb9dd0a7/87828154842.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e8ddf12cf8dcdea73b12915f5e88ac32/61148844770.pdfIn PDF document text
    • http://sdds.be/userfiles/file/36034756343.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/83256939525.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c184b4ae92d---78693744109.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822378150bd---duxodilopitorafepukav.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/82490111521.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i9ilcjrf3il7hi6vmm0rt409v6/xebutukekimozakim.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/35e9821443fa72ccfa039b2e88b19986/zexegatip.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/13769370784.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/padikavibolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pleural+cavity+is+filled+withPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 10716 bytes
SHA-256: 88ee2253db9de07b335760f7fb93ace43cbbb3b6bb62e6b6db3d8a9d5f1d5809
font_02_sfnt_off0001143f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 16644 bytes
SHA-256: 27f1549bd634a3dc61149e5e624189946e4c8e2e6bd2d71c78df0c16965fbe90